ACME. 259 



C. dent'iciilatus is yellowish^ with a yellowish-brown shell. 



Caeychium minhnum is a very minute animal^ with a 

 white^ thick-lipped shell. 



The CyclostomidcB are laud-snails_, with an operculum. 



Cyclostoma elegans has a pretty,, spirally-striated^ oval 

 shelly with rounded whorls^ and a flat, shelly^, few-whorled 

 operculum. The animal has a thick and long snout, at the 

 back of which are placed rather stout, subulate tentacles, 

 with eyes at their bases. The foot is oblong, with a central 

 division lengthwise, the sides being alternately contracted 

 when walking. 



Acme lineata : animal with long thin horns, with eyes at 

 their bases, and a turreted pupseform shell, with blunt apex 

 and a horny operculum. 



Although the British species of these two families are 

 few and small, they are the representatives of a numerous, 

 finCj and interesting series of mollusca in other parts of the 

 world. 



